<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Soft navigation with multiple popstate calls.</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="resources/soft-navigation-helper.js"></script>
</head>
<body>
  <main id=main>
    <div>
      <a id=link>Click me!</a>
    </div>
  </main>
  <script>
    // Push state 4 times, as history.back() calls will trigger popstate
   //  events.
    history.pushState({}, "", "foobar.html");
    history.pushState({}, "", "another_one.html");
    history.pushState({}, "", "and_another.html");
    history.pushState({}, "", "and_yet_another.html");

    // This function runs at the start of the popstate event.
    const eventPrepWork = t => {
      // If this is an event due to the first click, go back() twice more.
      if (!t.popped) {
        step_timeout(()=>history.back(), 0);
        step_timeout(()=>history.back(), 0);
        t.popped = 0;
      }
      ++t.popped;
      // return true for the second time the event fires, which is the first
      // back() triggered by the popstate event. The means that the first one
      // of those back() navigations would trigger a soft navigation, but not
      // the last one.
      return t.popped == 2;
    }
    const link = document.getElementById("link");
    link.addEventListener("click", () => {
      history.back();
      timestamps[counter]["eventEnd"] = performance.now();
    });
    testSoftNavigation({
      addContent: () => {
        // Add the content to the main element
        const main = document.getElementById("main");
        main.removeChild(document.getElementsByTagName("div")[0]);
        const div = document.createElement("div");
        const text = document.createTextNode("Lorem ipsum");
        div.appendChild(text);
        div.style="font-size: 3em";
        main.appendChild(div);
      },
      link: link,
      eventPrepWork: eventPrepWork,
      testName: "A soft navigation that started from a back() call inside a "
        + "popstate event is recognized by SoftNavigationHeuristics",
      eventType: "popstate"});
  </script>
</body>
</html>
